I have found out which is the problem!!!

((
I wrote an email to Elbox and this is the answer:
"
This is a problem of noise on the A1200 reset signal.
Voodoo 5 should always start with ProductID: 9.
Sometimes it starts with ProductID: 7, which is not correct.
This problem has been solved in the SX and TX models, where
we have added buffering of the A1200 reset signal.
"
Anybody have an idea on what I could do (without changing the busboard)?